Note: The map shows the area with a shaking intensity of 4 or greater, which the USGS defines as “mild,” although the earthquake may be felt outside the areas shown. The New York Times
A major earthquake measuring 7.4 magnitude struck Chile on Thursday, according to the United States Geological Survey.
The earthquake occurred at 9:50 p.m. Chile time about 45 kilometers southeast of San Pedro de Atacama, Chile, according to agency data.
Seismologists may revise the magnitude of the quake as they review available data. Additional information gathered about the quake may also prompt USGS scientists to update the shaking severity map.
Aftershocks in the region
An aftershock is usually a smaller earthquake that follows a larger earthquake in the same area. Aftershocks are usually minor changes along the portion of a fault that slipped at the time of the initial earthquake.
Earthquakes and aftershocks within 100 miles
Aftershocks can occur days, weeks, or even years after the initial earthquake. These events can be of equal or greater magnitude than the initial earthquake and can continue to affect areas that have already been damaged.
Source: United States Geological Survey | Notes: Shaking categories are based on the Modified Mercalli Intensity Scale. When aftershock data are available, the corresponding maps and charts include earthquakes within 100 miles and seven days after the initial earthquake. All times above are Chilean Daylight Time. Shaking data are as of Thursday, July 18, 10:19 p.m. Eastern Time. Aftershock data are as of Friday, July 19, 1:36 a.m. Eastern Time.
